Stool



FIG. 1 is a front perspective view of a stool according to my design;

FIG. 2 is a rear perspective view of the stool of FIG. 1;

FIG. 3 is a front perspective view of another stool according to my design; and

FIG. 4 is a rear perspective view of the stool of FIG. 3. 

The ornamental design for a stool, as shown. 